CBSE Class 12 Biology Organisms and Populations Question Bank

CBSE Class 12 Biology Organisms and Populations Question Bank. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

 ORGANISMS AND POPULATIONS

(QUESTION BANK)

1. Predators are prudent. Why? 1

2. Will the distribution level of species be affected by gradual increase in temperature? Say briefly 1

3. How is orchid ophrys pollinated by sexual deceit? 1

4. What is the relationship between egret and grazing cattle? Why? 1

5. Why is female mosquito not considered a parasite? 1

6. What is brood parasitism? 1

7. How is liver fluke adapted to parasitism? 1

8. Gause’s competitive exclusion principle, where does this apply? 1

9. How is competition avoided in Nature? Give example. 1

10. How have prey reduced impact of predation? 2

11. How have plants developed defence against predators? 2

12. How are the four levels of biological organisations in ecology interrelated? 2

13. How does temperature affect distribution of animals?Name two types based on their temperature tolerance. 2

14. How does water affect aquatic animals? Explain. 2

15. What is the importance of light for organisms? How do deep sea organisms get their energy? 2

16. Which is the deepest dwelling algae- red, green or brown, why? 2

17. What characteristic of soil determine the vegetation? How are these different at different places? 2

18. What adaptation have parasites evolved? 2

19. What do you mean by competitive release? 2

20. What are the roles of predators? 3

21. Give three example of mutualistic relationship. 3

22. Name the major biomes and the factors by which they vary. 3

23. What are the factors that lead to the variation in the conditions of the habitat? 3

24. How does constancy in the internal environment help an organism? How do organisms achieve it with regard to temperature? Give example. 3

25. What alternatives do organisms take if stressful external conditions are localized? Give examples. 3

26. What is altitude sickness? How does the body overcome this? 3

27. Give example of adaptation to desert condition shown by organisms. 5

28. Give example of biochemical adaption shown by organisms. What are the behavioral adaptations shown by organisms. 5

29. Define population and population density. How is it estimated? What are the attributes that determine the population characteristics? 5

30. What factors contribute to growth in population. In what way does logistic growth differ from exponential growth? 5

31. Define adaptation. What is the adaptation shown by,- a, whales, b, kangaroo rat, c, polar bear. Why do cold regions not have small animals? 5

32. Lions are natural predators .Can you compare this act with that of indiscriminate killing of animals

by humans for their leather horns etc . Comment .What can be done to create awareness about this. 4 

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